/**══════════════════════════════════╗
*作    者：songjinzhou                                                 ║
*职    业：我以我血荐轩辕                                              ║                                              
*CSND地址：https://blog.csdn.net/weixin_43949535                       ║
**GitHub ：https://github.com/TsinghuaLucky912/My_own_C-_study_and_blog║
*═══════════════════════════════════╣
*创建时间：                                                           
*功能描述：                                                            
*                                                                      
*                                                                      
*═══════════════════════════════════╣
*结束时间:                                                           
*═══════════════════════════════════╝
//                .-~~~~~~~~~-._       _.-~~~~~~~~~-.
//            __.'              ~.   .~              `.__
//          .'//              西南\./联大               \\`.
//        .'//                     |                     \\`.
//      .'// .-~"""""""~~~~-._     |     _,-~~~~"""""""~-. \\`.
//    .'//.-"                 `-.  |  .-'                 "-.\\`.
//  .'//______.============-..   \ | /   ..-============.______\\`.
//.'______________________________\|/______________________________`.
*/
#include <iostream>
#include <vector>
#include <string>
#include <unordered_map>
#include <ctype.h>
#include <queue>
#include <list>
#include <map>
#include <math.h>
#include <algorithm>
#include <iomanip>
#include <cmath>
using namespace std;


int main()
{
#if A
	cout << "This is my first c program!" << endl;
#endif

#if B
	cout << "********************" << endl;
	cout << "Very Good!" << endl;
	cout << "********************" << endl;
#endif

#if C
	int a = 123, b = 456, sum;
	sum = a + b;
	cout << "sum=" << sum << endl;
#endif

#if D
	int a, b;
	cin >> a;
	cin >> b;
	cout << a + b << endl;
#endif

#if E
	double a, b, c, tem;
	scanf_s("%lf%lf%lf", &a, &b, &c);

	if (a != 0 && (b * b - 4 * a * c) > 0)
	{
		tem = sqrt(b * b - 4 * a * c);
		printf("r1=%7.2f\n", (-1 * b + tem) / (2 * a));
		printf("r2=%7.2f", (-1 * b - tem) / (2 * a));
	}
#endif

	char mystr[8] = { 0 };
	scanf("%s", mystr);
	printf("%s\n", mystr);

	return 0;
}
/**
*备用注释：
*
*
*
*/